Movies
Why don't skeletons play music in church? Because they got no organs.
— The Centipede · James and the Giant Peach

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
It's a groaner of a pun. Skeletons supposedly can't play music in church because they lack organs, which works two ways: the instrument found in churches, and the body parts a skeleton doesn't have. The fun is in the double meaning.
Context reviewed